Remove deprecated `create-release` action and use `softprops/action-gh-release` instead

[ericpre]

xref https://github.com/LumiSpy/lumispy/issues/76

Progress of the PR

• [x] Remove deprecated create-release action and use softprops/action-gh-release instead,
• [x] pinned actions to a commit SHA,
• [n/a] docstring updated (if appropriate),
• [n/a] update user guide (if appropriate),
• [n/a] added tests,
• [x] added line to CHANGELOG.md,
• [x] ready for review.

[jlaehne]

Do we need to activate dependabot in this repo as well then?

[ericpre]

Do we need to activate dependabot in this repo as well then?

Yes, now done!